Gay throuple

In a gay throuple, two men in love invite a third man to join their union and form a gay throuple. But the catch here is that all the three men who come together to form a gay throuple relationship are in love with each other.

Throuples can be open (meaning you also are sleeping with people outside of the throuple) or closed (meaning it's just you and your two hubbies). I am under the firm impression that every queer.